Gun hunting seasons will be here sooner than you know it! There are several ways to carry a long gun safely and, at the same time, have your gun ready for quick use in the field. The carry you use will depend on whether you have companions in the field, where they are, and what type of terrain you'll be traversing.
Whichever carrying method you use, these basic gun safety rules will always apply: Always keep the muzzle pointed in a safe direction; always keep the safety in the "on" position when carrying a long gun; and always keep your finger outside the trigger guard.
1. Two-Hand or Ready Carry (shown above)
The "two-hand" or "ready carry" is considered the safest carry for hunters. This carry gives you good control of the muzzle and allows you to raise your gun quickly for a shot. The only "con" is that depending upon the firearm's weight and your physical endurance, this carry method may become tiring.
2. Cradle Carry
The "cradle carry" is another safe carry. In this position, the gun's weight is distributed closer to the body, so it's less tiring. However, because the muzzle points to one side, this method should not be used when walking beside anyone.
3. Trail Carry
Trail carry is safe when several people are walking abreast. It you're walking in single file, this position is only safe if you're the leader of the line. Others in the line shouldn't carry their long guns this way, else their muzzles may wind up sweeping the feet and legs of the people walking ahead.
4. Elbow or Side Carry
The "elbow carry" or "side carry" position is safe when walking in open terrain. It should NOT be used when walking through brush, because branches can get tangled around the gun and push the barrel downward. Do not use the elbow carry when people are walking ahead of you!
5. Shoulder Carry 
Shoulder carry is less tiring than other carry positions. It's safe when walking beside or behind someone, or if you are alone. Special care must be taken to keep the muzzle pointed upward. Never use this carry method when others are behind you.
6. Sling Carry
Sling carry is often used by hunters who must walk a long way before taking a shot. The sling carry leaves both of the hunter's hands free. However, when walking in dense brush, it should not be used. The gun may get caught in brush and pulled off the hunter's shoulder. There are some additional considerations you should be aware of when bending over with a slung long gun (see here for more)!
As you can see, the primary consideration here is controlling the direction of the muzzle so that it doesn't ever inadvertently point at another human being. When hunters are positioned in a line abreast, the hunters at either end shoud use cradel or side carry. The hunters in the middle should use either the side or two-hand carry.
When walking single file, the leader may choose any of the carries except shoulder carry. Center of the line hunters should use the two-hand or cradle carry. The last person in line may use the two-hand, cradle, or shoulder carry.
